Advanced Fetal Monitoring

What is fetal monitoring?

In pregnancy and during labor, your healthcare provider will want to check the health of your unborn baby (fetus). This is done by checking the baby’s heart rate and other functions. Fetal monitoring is a very common procedure.

Monitoring can be done in two ways. It can be done on the outside of your belly (external monitoring). Or it can be done directly on the baby while inside your uterus (internal monitoring):

• External monitoring. This may be done with a special tool called a fetoscope. It’s a stethoscope that has a different shape. It may also be done using Doppler. This is an electronic tool that uses sound waves and a computer.
• Internal monitoring. A small wire (electrode) is put on your baby’s head while they are inside your uterus.

Fetal heart rate monitoring is used to check the rate and rhythm of the heartbeats. It looks for any increases or decreases in the baby’s heartbeat. It also checks how much the baby’s heart rate changes. The average fetal heart rate is between 110 and 160 beats per minute. The fetal heart rate may change as the baby responds to conditions in the uterus. An abnormal fetal heart rate or pattern may mean that the baby is not getting enough oxygen or there are other problems. An abnormal pattern also may mean that an emergency cesarean section (C-section) delivery is needed.

How to get ready for fetal monitoring?

Getting ready for fetal monitoring depends on if it's external or internal. It also depends on if it's being done late in pregnancy or during labor.

For external fetal monitoring during pregnancy with a Doppler, you may need to have a full bladder. There is no restriction of food or drink. You’ll be given a consent form to sign. Make sure to ask questions if needed.

For fetal monitoring during labor, your healthcare provider will tell you if any preparation is needed.

What happens during fetal monitoring?

The details may vary, but typical electronic fetal monitoring may go like this:

• The provider will put gel on your belly. This helps to send sound waves from your belly to the computer.
• The provider puts a device called an ultrasound probe (transducer) on your belly. It’s attached to your belly with straps. This device sends the fetal heartbeat to a recorder. The fetal heart rate is displayed on a screen. It may also be printed on special paper.
• The provider may put another device over the top of your belly with a belt. This is called an external tocodynamometer. It can record the patterns of contractions.

In some cases, you may need internal fetal monitoring for a more accurate reading of the fetal heart rate. This can only be done if your bag of waters (amniotic sac) is broken and your cervix is partly open (dilated). The provider puts a small wire called a fetal scalp electrode through your open cervix. It’s attached to your baby’s scalp. The electrode is attached to a wire. The wire sends information about your baby’s heartbeat to a computer.

What happens after fetal monitoring?

After external fetal monitoring, the provider removes the straps and wipes the gel off your belly. After internal fetal heart rate monitoring, the provider checks your baby’s scalp and cleans it where the electrode was stuck.